Improvement in tool-carriers for dental engines



T. GOGSWELL.

TOOL-CARRIERS FOR DENTAL-ENGINES.

Patented. Nov. 16, 1875.

his flttorney W @fi WITNESSES PETERS. PHOTO-LITHOGRAPHER, WASHKNGTON. DC,

' UNITED srrrrns PATENT QFrIon.

THOMAS OOGSWELL, OF BOSTON, MASSACHUSETTS, ASSIGNOR TO SAMUEL S. WHITE,OF PHILADELPHIA, PENNSYLVANIA.

IMPROVEMENT IN TOOL-CARRIERS FOR DENTALENGINES.

Specification forming part of Letters Patent No. 170,657, dated November16,1875 application filed November 5, 1875.

To all whom it may concern Be it known that I, THOMAS COGSWELL, ofBoston, Massachusetts, have invented certain new and useful Improvementsin Tool-Carriers for Hand-Pieces of Dental Engines, of which thefollowing is a specification:

My invention relates to acarrier of that class adapted for the supportof rotary tools, such as burrs, drills, disks, 8210., known as angleattachments and my object is to support and rotate the tool in thecarrier at an angle both to the carrier and to the hand-piece, and in afixed position relatively thereto.

The subject-matter claimed will hereinafter specifically be designated.

In the accompanying drawings, which represent my improvedinstrument onan enlarged scale, Figure 1' is a view in. elevation; and

- porting a rotary tool-holder projects at an angle from the outer endof the hand-piece attachment, with which it is rigidly united. Thecarrier is, in this instance, made in two sections, being composed of anangular arm, 0, which may either be formed with, or detachably butfirmly connected to, the tubular part A, and a removable side piece orplate, G, together constituting a frame projecting beyond the end of thehand-piece, in which gearing for communicating motion from thedrivingspindle B to the tool is mounted. The arm (J, as shown, is, for aportion of its length, parallel with the hand-piece attachment A, thenbends or turns at a right angle, crossinga line drawn throughthelongitudinal axis of the hand-piece, and then is inclined outward,projecting laterally and away from the outer end of the handpieceattachment. That portion of the arm 0 which crosses the axis of thehand-piece attachment at a right angle forms a bearing for the outer endof the spindle B, as shown. A bevelpinion, D, fast on the end of thespindle B, outside of the arm, turns freely with the spindle upon thearm, andgears with a corresponding pinion, E, mounted upon thelaterally-projecting inclined portion of the arm. This pinion, in turn,meshes with a pinion, F, mounted in the arm, near its outer end. The,piuion E is shown as turning upon a pivot formed by a bolt or pin, G,having a screw out at one end and an ordinary head at the other, whichremovably fastens it in positionin the arm and plate of the sectionalcarrienframe, and the pinion F is formed with a hollow central hub ortrunnion, H, projecting at the sides of the pinion and turning in thesections of the frame. The hub of the pinion F, it will be seen, is atan angle both to the hand-piece attachment or support A and to thecarrier, and forms a holder or socket for the tool shank or spindle.

The hub, in this instance, is shown as internally threaded to receiveand hold the correspondingly-threaded shank of' a tool. 0bviously, otherwell-known means of detachably securing the tool in the holder may beemployed.

By removing the screw-bolt G the plate 0 (which, it will be seen, formsa cap-piece for partially covering and protecting the gearing) may bedetached from the arm 0, and the gearing removed. This plate may, ifdesired, be dispensed with, and the pinions supported in bearings in thearm only, which might of itself constitute the carrier; but I prefer toemploy the plate, as it gives a firmer bearing for the tool-holder, thusrendering the tool steady in operation and lessens strain on the parts,the sections of the frame mutually sustaining and bracing each other,while admitting of the ready separation of the parts. The angle at whichthe carrier projects from the hand-piece obviously may differ from thatherein shown and described, and be such as best adapted to the tool tobe used, or the work to be performed.

By forming .a shoulder upon the pivot Gr, above its threads, as shown,accidental clamping of the pinions between the frame-sections isprevented, the shoulder bearing against the arm when the pivot isscrewed down, and holding it and the plate the proper distance apart.

The tool, it will be observed, when inposition, lies at an acute or atan obtuse angle; to the hand-piece, according as, it is used as; a frontor as a back action, which positions experience has demonstrated to bemore advantageous than the right-angle attachments at present in use. Ihave shown three gears to drive the tool. but the intermediate one. may

united to the hand-piece attachment and. proejectinglaterallytherefrom,the gearing, mounted in the carrier, and thetool'holder, likewise mounted therein, both at an angle theretoand tothe hand-piece; attachment, these members being constructed andoperating in combination, substantially as set forth.

2'. The sectional tool-carrier and gearingframe. consisting of thecombination of the angular arm and the plate detach-ably securedthereto, substantially as set forth, whereby the gearing is protectedand removabl; se-

cured in position.

In testimony whereof, I h-ayehereunto subscribed my name.

- THOS. OOGSWELL.

Witnesses: I

WM. UOGSWELL, O. S. BOVELL.

